Maintenance; Troubleshooting - Johnson Controls LN-IO -1 Series Installation Instructions Manual

Maintenance

Risk of Electric Shock.
Disconnect the power supply before making electrical connections to avoid electric shock.
Risque de décharge électrique.
Débrancher l'alimentation avant de réaliser tout raccordement électrique afin d'éviter tout risque de décharge
électrique.
Each controller requires minimal maintenance, but it is important to:
• clean the outside of the front plate an/or the inside of the back plate, use a dry cloth.
• verify the tension of all wires and cables each time you service the controller.
Disposal
The Waste Electrical and Electronic Equipment (WEEE) Directive sets regulations for the recycling and disposal of
products. The WEEE2002/96/EG Directive applies to stand-alone products that can function on their own and are
not a part of another system or piece of equipment.
For this reason, Johnson Controls® products are exempt from the WEEE Directive. Nevertheless, they are marked
with the WEEE symbol, indicating the devices are not disposed with municipal waste.
Dispose of products at the end of their useful life according to local regulations and the WEEE Directive.

Troubleshooting

Table 2 describes some troubleshooting scenarios.
Table 2: Troubleshooting (Part 1 of 2)
Problem
Controller is powered but does not turn on.
Fuse Is Blown
Power Supply Polarity
Device cannot communicate on a FTT network.
Absent or Incorrect Supply Voltage
Overloaded Power Transformer
Network Not Wired Properly
Absent or Incorrect Network Termination
Service Pin Not Working
Device communicates well over a short network but does not communicate on large network.
Network Length
LN Application Specific, Remote I/O, and Free Programmable Controllers Installation Instructions
Possible Solution
Disconnect power from the device and check the fuse integrity. Then wait a
few seconds to allow the auto-reset fuse to cool down. Reconnect power.
Verify that consistent polarity is maintained between all controllers and the
transformer. Ensure that the COM terminal of each controller is connected to
the same terminal on the secondary side of the transformer. See Figure 3.
1. Check power supply voltage between 24 VAC/DC ±15% and COM pins,
and ensure that it is between acceptable limits.
2. Check for tripped fuse or circuit breaker.
Verify the transformer is powerful enough to supply all devices.
Double-check the wire connections are correct.
Check the network terminations.
Use the memory erase jumper to reset the Neuron chip's memory, then load
the proper APB or NXE into the controller using LN-Builder 3.4 or another
network management tool.
Check that the total wire length does not exceed the specifications of the
Junction Box and Wiring Guideline for Twisted Pair L
13
W Networks.
ON ORKS